calcium {boot} | R Documentation

## Calcium Uptake Data

### Description

The `calcium` data frame has 27 rows and 2 columns.

Howard Grimes from the Botany Department, North Carolina State University, conducted an experiment for biochemical analysis of intracellular storage and transport of calcium across plasma membrane. Cells were suspended in a solution of radioactive calcium for a certain length of time and then the amount of radioactive calcium that was absorbed by the cells was measured. The experiment was repeated independently with 9 different times of suspension each replicated 3 times.

### Usage

    data(calcium)

### Format

This data frame contains the following columns:

`time`
  The time (in minutes) that the cells were suspended in the solution.
`cal`
  The amount of calcium uptake (nmoles/mg).

### Source

The data were obtained from

Rawlings, J.O. (1988) Applied Regression Analysis. Wadsworth and Brooks/Cole Statistics/Probability Series.

### References

Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Methods and Their Application. Cambridge University Press.

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